Qt- generate a dump file

Disclaimer: This article is a blogger original article, shall not be reproduced without the bloggers allowed. https://blog.csdn.net/a844651990/article/details/85225273

Brief introduction

  Before reprinted an article Qt- generate a dump file before you let your client crashes , the article describes how to generate a crash log, not enough visual image, if we can generate a dump file vs open so much the better, let's start introduction.

Qt + MSVC compiler

   This situation is actually relatively simple, adding "CONFIG + = force_debug_info" "CONFIG + = separate_debug_info" on additional parameters build configuration items directly qmale where we can, mainly used to generate pdb files.

Dump Dump function Helper.h header file:

#pragma once
#include <tchar.h>
#include <Windows.h>
#include <DbgHelp.h>

#pragma comment(lib, "user32.lib")

int GenerateMiniDump(PEXCEPTION_POINTERS pExceptionPointers)
{
	// 定义函数指针
	typedef BOOL(WINAPI * MiniDumpWriteDumpT)(
		HANDLE,
		DWORD,
		HANDLE,
		MINIDUMP_TYPE,
		PMINIDUMP_EXCEPTION_INFORMATION,
		PMINIDUMP_USER_STREAM_INFORMATION,
		PMINIDUMP_CALLBACK_INFORMATION
		);
	// 从 "DbgHelp.dll" 库中获取 "MiniDumpWriteDump" 函数
	MiniDumpWriteDumpT pfnMiniDumpWriteDump = NULL;
	HMODULE hDbgHelp = LoadLibrary(_T("DbgHelp.dll"));
	if (NULL == hDbgHelp)
	{
		return EXCEPTION_CONTINUE_EXECUTION;
	}
	pfnMiniDumpWriteDump = (MiniDumpWriteDumpT)GetProcAddress(hDbgHelp, "MiniDumpWriteDump");

	if (NULL == pfnMiniDumpWriteDump)
	{
		FreeLibrary(hDbgHelp);
		return EXCEPTION_CONTINUE_EXECUTION;
	}
	// 创建 dmp 文件件
	TCHAR szFileName[MAX_PATH] = { 0 };
    TCHAR szVersion[] = L"DumpFile";
	SYSTEMTIME stLocalTime;
	GetLocalTime(&stLocalTime);
	wsprintf(szFileName, L"%s-%04d%02d%02d-%02d%02d%02d.dmp",
		szVersion, stLocalTime.wYear, stLocalTime.wMonth, stLocalTime.wDay,
		stLocalTime.wHour, stLocalTime.wMinute, stLocalTime.wSecond);
	HANDLE hDumpFile = CreateFile(szFileName, GENERIC_READ | GENERIC_WRITE,
		FILE_SHARE_WRITE | FILE_SHARE_READ, 0, CREATE_ALWAYS, 0, 0);
	if (INVALID_HANDLE_VALUE == hDumpFile)
	{
		FreeLibrary(hDbgHelp);
		return EXCEPTION_CONTINUE_EXECUTION;
	}
	// 写入 dmp 文件
	MINIDUMP_EXCEPTION_INFORMATION expParam;
	expParam.ThreadId = GetCurrentThreadId();
	expParam.ExceptionPointers = pExceptionPointers;
	expParam.ClientPointers = FALSE;
	pfnMiniDumpWriteDump(GetCurrentProcess(), GetCurrentProcessId(),
		hDumpFile, MiniDumpWithDataSegs, (pExceptionPointers ? &expParam : NULL), NULL, NULL);
	// 释放文件
	CloseHandle(hDumpFile);
	FreeLibrary(hDbgHelp);
	return EXCEPTION_EXECUTE_HANDLER;
}

LONG WINAPI ExceptionFilter(LPEXCEPTION_POINTERS lpExceptionInfo)
{
	// 这里做一些异常的过滤或提示
    if (IsDebuggerPresent()) {
		return EXCEPTION_CONTINUE_SEARCH;
	}
	return GenerateMiniDump(lpExceptionInfo);
}

transfer:

#include <QApplication>
#include "Helper.h"

int main(int argc, char *argv[])
{
    SetUnhandledExceptionFilter(ExceptionFilter);

    QApplication a(argc, argv);

    int *p = nullptr;
    *p = 100;

    return a.exec();
}

  To a null pointer assignment program will certainly crash out.
  Then we will pdb file and generate dump files are copied to the source directory:



then use VS2015 to open the dump file:

Click set the symbol path, select the Microsoft Symbol Server, click to confirm, for the first time, then the time will be longer, be patient:

Then click only limit native debugging, and then navigate to the location of the code will be problems, there will be debugging information is very easy:

Use google framework of breakpad

Breakpad on the use of the Qt framework, this article is talking about well, you can see next.
https://github.com/JPNaude/dev_notes/wiki/Using-Google-Breakpad-with-Qt